barcode reader in asp.net No hardware resources of the PIC microcontroller (i.e., the USART) except for the in Software

Drawer QR Code 2d barcode in Software No hardware resources of the PIC microcontroller (i.e., the USART) except for the

1 No hardware resources of the PIC microcontroller (i.e., the USART) except for the
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EEPROM/Flash read/write registers could be accessed while the PIC microcontroller was in debug mode. Serial communications relied upon bit-banging functions. 2 Only one breakpoint is available in the application. If I were to implement multiple breakpoints, I would have to put in code like:
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movwf swapf movwf movlw movwf goto _w ; Save the w Register PCLATH, w ; Save the current PCLATH Register _pclath HIGH BreakpointVector PCLATH ; Setup the Jump to the Next page (BreakpointVector & 0x07FF) | ($ & 0x01800)
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This would make setting single-step stop points at skip instructions (which have two possible stop points) impossible as well as making it impossible to set breakpoints for goto loops that were less than six instructions from their destinations. 3 At the end of an operation, the PIC microcontroller has to be reset (to put it back into internal debug mode). Using a 74123 single shot to toggle reset, I was able to accomplish this, but I felt the circuit was kludgy.
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THE EMU-II
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After experimenting with the built-in debugging mode of the PIC16F87x, I settled on the design that I am presenting in this section, which does not utilize the built-in debugging features of the PIC microcontroller. The resulting application is surprisingly fast (especially considering it works at 1200 bps) and very useful for new application developers. This application is probably the most complex of anything presented in the book (as well as being far and away the longest). Despite having 6,400 instructions to work with, I found that I had to come up with some new ways of doing things in order to t in all the functions that I wanted. Ideally, I would like to implement a line assembler as part of the EMU-II package but for that, I would require 1,000 or more free instructions in program memory. There are four aspects of this application that I would like to bring to your attention, as I believe they are noteworthy and may help you out in your own applications. The rst is how the text table reads are implemented in the EMU-II application. For most other applications, I pass a text message number to a SendMsg subroutine, which reads through a large table of ASCIIZ messages to nd the speci c ASCIIZ message. When the selected message is found, it is output via the serial port until the ending NUL (0x000) character is encountered. For the EMU-II, I had planned on implementing a large number of text messages to help guide the user (I wasn t expecting to have an application like the YAP-II Windows Interface to help the user). The message table that was developed was 2,888 ASCII characters long. If this table was used directly in the application, it would take up 45 percent of the total I had available. The solution to this problem was to compress the tables so that two 7-bit ASCII characters could be placed in a single 14-bit instruction location. This would eliminate the two retlw instructions and take advantage of the PIC16F87x to read its own program memory. To do this, I started with a typical table declaration (the compress.asm le in the code\EMU-II subdirectory of the PIC microcontroller directory) like this:
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MsgTable Msg0 dt Msg1 dt Msg2 dt Msg3 dt Msg4 dt dt dt dt dt dt ; ; 0x00D, 0x00A, 0 ; > , 0 ; 8, , 8, 0 ; Introductory Message Enter H for Commands , 0x00D, 0x00A, 0 ; Help Message The Commands are: , 0x00D, 0x00A H - Help , 0x00D, 0x00A D - Download Application , 0x00D, 0x00A ! [D|A] - Reset the Emulated Processor/Set the PORTA Type 0x00D, 0x00A [1 [Address]] - Single Step from the Current PC Address or Backspace Put in the Prompt Message: List of Messages Start with \r\n (New Line)
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